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Screw compressor

a screw compressor and compressor body technology, applied in the direction of machines/engines, liquid fuel engines, positive displacement liquid engines, etc., can solve the problem that the oil level detection means disposed in the interior of the screw compressor cannot be utilized, and achieve the effect of preventing damage to the bearings, reducing viscosity, and avoiding oil shortages

Active Publication Date: 2009-07-30
KOBELCO COMPRESSORS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a screw compressor with a separate chamber for detecting the level of oil in the bearing casing and supplying oil to the compressor. The oil level detecting means is placed in the chamber and communicates with the interior of the compressor through an oil line and a communication line. This allows for accurate detection of the oil level without being influenced by variations in oil level in the interior of the compressor. The oil level detecting means can be placed in the chamber separately from the bearing casing, and an oil temperature detecting means can also be included. This prevents damage to the bearings caused by lowering of the oil level and ensures proper lubrication. The oil level detecting means can also be used to control the oil level in the compressor and prevent oil shortage in the bearings. The separate chamber can have a simple structure and can serve as both a structure for detecting the oil level and a structure for supplying oil to the compressor.

Problems solved by technology

When rotors are rotating in the screw compressor, oil level detecting means disposed in the interior of the screw compressor cannot be utilized because the oil level at the bottom of the bearing casing is oscillating due to splash of oil.

Method used

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Embodiment Construction

[0022]An embodiment of the present invention will be described below with reference to the accompanying drawings.

[0023]FIG. 1 illustrates a screw compressor 1 according to an embodiment of the present invention. The screw compressor 1 is a water lubrication type screw compressor wherein screw rotors 2 and 3 are cooled and lubricated with water. In the screw compressor 1, a pair of male rotor 2 and female rotor 3 meshing with each other are accommodated within a rotor casing 4. Rotor shafts 5 and 6 of the rotors 2 and 3 are disposed horizontally. One end of the rotor casing 4 is closed with a cover 7, while to an opposite end of the rotor casing 4 is mounted a motor casing 11 which accommodates a motor 10 composed of a rotor 8 and a stator 9. An end portion of the motor casing 11 is also closed with a cover 12. The rotor shaft 5 of the male rotor 2 and a motor shaft 13 of the motor 10 share an integrally-formed shaft (separate rotor shaft 5 and motor shaft 13 may be coupled together ...

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PUM

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Abstract

A screw compressor is disclosed wherein a pair of rotor shafts are disposed horizontally and an oil sump is formed at the bottom of a bearing casing which accommodates bearings for supporting the rotor shafts, a bearing lower portion being soaked into oil present in the oil sump for lubrication. The screw compressor comprises a chamber provided separately from the bearing casing, an oil line for communication between the oil sump in the bearing casing and the chamber and oil level detecting means disposed in the chamber. According to this structure, the oil level in the bearing casing can be checked accurately and there is no fear of oil shortage in the bearings.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a screw compressor.[0003]2. Description of the Related Art[0004]In a conventional screw compressor having a pair of male and female screw rotors with rotor shafts disposed in the horizontal direction, a timing gear and bearings are mounted on each of the rotor shafts and are lubricated and cooled with oil to prevent damage thereof.[0005]In connection with the related art, an oil bath method is mentioned as a general lubricating method used in case of low- or medium-speed rotation. In the oil bath method it is desirable to install an oil gauge and thereby make it possible to check the oil level easily so that the oil level lies at the center of a bottom roller in principle. However, when it is intended to adopt the oil bath method for lubrication of bearings and timing gears in a positive-displacement compressors such as, for example, a screw compressor, it may not always be possible to i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01C21/04
CPCF01C21/04F04C18/16F04C2270/86F04C29/021F04C2240/809F04C28/28F04C18/18
Inventor YOSHIMURA, SHOJINOGUCHI, TORU
Owner KOBELCO COMPRESSORS CORP
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